Molding core



June 7, 1927.

l 1,631,154 J. C. POETZ HOLDING com Filed Dec. 21. 1925 Jo/m C P062?@Wemag Patented June 7, 1927.

UNITED ySTATES JOHN C. POETZ, OF LEONIA, IDAHO.

v MODDING conn.

Application filed December 21, 1925. Serial No. 76,584.

My pres-ent invention relates to improvements in molding coresespecially designed for use with plastic material in the construction ofconcrete building structures involving cellular-'or hollow monolithicwalls.'

The primary object of the invention is the provision of a hollowimplement of this character which may be constructed of sheet metal orother suitable material and provided with means for centering andaccurately placing the core in position for pouring or tamping theplasticconcrete material. The vcores are used preferably in rows,- indesired numbers in the process of constructing courses or layers in thewall and they are spaced apart in order that the material may fill thespaces formed between adjoining implements or cores. Means are providedfor accurately and conveniently spacing` the cores with relation one toanother and such spacing means contemplate interchangeable parts for usewith the cores whereby the desired distances between the cores or thecells formed about them may be predetermined. The cores are removableand are fashioned with features which facilita-te their removal orwithdrawal from the formed cell after the concrete or plastic materialhas set.

The invention consists in cert-ain novel combinations and arrangementsof parts for accomplishing the above indicated purposes and functions aswill hereinafter be more fully set forth and claimed.

In the accompanying drawings I have illustrated one complete example ofthe physical embodiment of my invention wherein the parts are combinedand arranged in accord with .the best mode I have thus far devised forthe practical application of the principles of my invention.

Figure 1 is a perspective view of a. hollow core embodying my invention.

Figure 2 is a vertical sectional view of ,the core showing it in asection of the concrete wall.

Figure 3 is a transverse sectional view of the core at line 3-3 ofFigure 1.

In carrying out my invention the cores may be fashioned in uniform sizesand shapes and employed for molding cells or spaces of complementarysize and shape in the concrete wall, and these cells may be spaced atuniform distances apart7 the distance being predetermined to suitdifferent conditions in the structure.

In the present exemplification of my invention I have utilized agenerally rectangular shaped hollow core for fashioning a generallyrectangular shaped cell C the upper end of which is closed by a metalreinforcing plate P in Figure 2 where a portion of the concrete wall IVis shown in section.

The core body 1 maybe made up of sheet metal or other suitable materialwith bulging or convex sides and rounded corner-s2 to facilitatewithdrawal or removal of the core from the cell after the concrete isset. rlh-e ycore body is open at top and bottom and these parts areclosed by removable plates 3 and 4 the former for the bottom and thelatter for the top of the open end core.

The bottom plate is secured within the open lower end of the core bodyand is fashioned with a. central perforated boss 5 struck up fromtheplate for the reception of 'a tie bolt 6 having an enlarged head 7 onits lower end below the bottom plate.l

The bottom plate as here used is a flat generally rectangular plate withrounded edges to conform to the interior of the core body and fit snuglyand neatly within the interior of the open lower end of the core body.At its four. sides the bottom plate is fashioned with turned-down lugs 8that are seated in the concrete base when the core is placed inposition, and with turned up lugs 9 which are slipped or inserted in theloops or complementary straps 10 one of which is attached at the innerside of each of the four walls of the core body. These lugs 8 are usedin centering the core in place and seating it firmly on the concretebase preparatory to filling the spaces about the cores and tamping theconcrete into place.

The top plate 4L of the core is preferably dished as shown to strengthenit and to form an annular groove 12 at its under side to neatly fit overthe top edge of the core body, and a retaining shoulder or flange 13 ofthe dished plate lits over the top edge and 'down the side of the corebody a suficient distance to form a cover for the interior of the corebody and prevent access of lling material to the interior of the core.

The threaded endof the central tie bolt 6 is passed up through a bolthole 14 in the center of the top plate, and a clamp nut 15 is threadedon the end of the bolt against the top face of the top plate. By turninghome the nut on the projecting bolt-,end the two heads or plates 3 and 4of the core are clamped between the bolt head 7 in the boss 5 and thenut l5 on the top of the topplate l of the core.

In use the cores are placed in rows'or in other formations and spacedl`uniform disf.

tances apart from their centers andthese distances may be varied by theuse of gage devices preferably arried on the topplatie's of the cores.For this purpose the'top plate is fashioned with' gage-lugs 16 at threeof its sides for contactI with adjoining gage lugs as indicated inFigure 2, and a larger or'longer gage lug 17 is provided on the tourt-hside ofthe top plate for contact with a lateral form 18 used in erectingtne concrete-wall, It will be apparent that by lengthening the gage lugs16 and placing' in contact complementary lugs on adjoining core platesthe distancesbetween centers of' the coreswill be increased and theresulting cells C willbe spaced farther apart. Regardless of the shapeof the top plate and .cross sectional shape of the core body, these gagelugs may be diametrically disposed with relation to the core body forcoaction with complementary gage plates. j

From the above description taken'in connection with my drawings theutility of the implement and its-mode ofV use will be apparent, and itwill be evident that the implement as thus constructed and used iscoin',-

pact, well braced, comparatively light in weight, durable, and efficientin the performance ot its required` tunctlols.

Having thus fully described my inven` tion, what I claim as new anddesire to secure by Letters Patent isl. The combination with a core bodyhaving` an open top and bottom, of removable top and bottom plates, atie bolt and nut connecting said plates,and means for retaining inposition the clamped top and bottom plates. Y

2. The combination with a` core body hav- Y lng an open top and bottom,of removable top and bottom plates and a connecting rclamp bolt, guidedevices on the exterior of plementary devices on an adjoining laterallyl disposed core.. Y

4. Thecombinationwith a core body llaving interior retaining loops, of areinoyable plate'having lugs to co.-a ot with said'lOQps, a top platethe core and a clamping bolt for said plates. e

In testimony whereof I aliiX my signa-V ture.

JOHN G, PonTZ,

